12/16/15

What are the intervals of increasing and decreasing, and the intervals of concavity of the following?
What are the intervals of increasing and decreasing, the local min and max and the intervals of concavity of the following?   y = exsin(x)  -pi ≤ x ≤ pi   I know I need the first derivative,... more
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12/15/15

2 different integrals
∫x/(X2 +3)  = .5 ln(x2+3)       u=x2+3 du = 2x dx   1/2 ∫ 1/(x2+3)  =  1/2 *ln(x2+3)   here ∫ 1/(x2+3) gives is... more
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12/15/15

Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’s Rule doesn’t apply, explain wh
Find the limit. Use l’Hospital’s Rule where appropriate. If there is a more elementary method, consider using it. If l’Hospital’sRule doesn’t apply, explain why.   lim (x --> 0)   [ √(1 + 2x)... more
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12/15/15

help me please
The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 30 minutes of calls is $15.20, and the... more
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12/13/15

Form a polynomial function with the given zeros
Zeros: -4,2+i
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12/13/15

find three consecutive odd intergers such that the product of the first two equals two more than the square of the largest number.
Having trouble setting up  
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12/11/15

Find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 3 times the third
Find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 3 times the third.
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12/11/15

Leah has 28 more marbles than Dan. 1/3 of Leah’s marbles is equal to 4/5 of Dan’s marbles. Find the amount of Leah’s marbles.
I need helpppppp
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12/10/15

Find the inverse of y=log9x
 The nine is the base, and x is the argument/power.
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12/08/15

Use implicit differentiation to find an equation of the tangent line to the curve at the given point
Use implicit differentiation to find an equation of the tangent line to the curve at the given point.   x2 + xy  + y2 = 3, (1, 1)     ANSWER: y = -x + 2 #27, p215
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12/08/15

Find the derivative. Simplify where possible. y = cosh ^-1 (x^1/2)
Find the derivative. Simplify where possible:   y = cosh-1 (√x)     ANSWER: 1 / [2 √(x (x - 1)) ] #41, p263
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12/08/15

A camera is 2000 ft. from the lauch pad of a rocket. The height of the rocket is given by h(t) = 50t^2 . What is the rate of change of the angle of elevation o
(a) A camera is 2000 ft. from the launch pad of a rocket. The height of the rocket is given by h(t) = 50t2. What is the rate of change of the angle of elevation of the camera 10 seconds after... more
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12/08/15

Distance of to people running away from each other, derivates
Pam is seated 300m away from the center of a circular track of radius 100m and is watching John run laps at a speed of 5m/s. How fast is the distance between Pam and John changing when John is... more
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12/08/15

2. Lemniscate Curve, Find the exact coordinates of the point(s) where the tangent line to this curve is horizontal
Curve:   (x2+y2)2=4(x2-y2)   Find points where tangent line is horizontal?
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12/08/15

Rational Zeros Question: Please help!
List all possible rational zeros for the given function: f(x) = 2x^3 + x^2 - 3x +1 Use synthetic division to test the possible rational zeros and find an actual zero Then use your quotient from the... more
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12/06/15

Use logarithmic differentiation to find the derivative of the function : y = [(x - 1) / (x^4 + 1]^1/2
Use logarithmic differentiation to find the derivative of the function :   y = √[(x - 1) / (x4 + 1)]     ANSWER: √[(x - 1) / (x4 + 1)]  *  [(1 / (2x - 2)  -  2x3 / (x4 + 1)] #41, p223
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12/06/15

Evalute the definite integral below.
Evalute the definite integral below.     ∫0^pi/2 x cos 2x dx
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12/06/15

pre calculus
A suspension bridge has two main towers of equal height.  A visitor on a tour ship approaching the bridge estimates that the angle of elevation to one of the towers is 19 degrees.  After sailing... more
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12/06/15

Use logarithmic differentiation: (x^2 + 2)^2 * (x^4 + 4^4
Use logarithmic differentiation: (x2 + 2)2 * (x4 + 4)4     ANSWER: (x2 + 2)2 * (x 4+ 4)4 * [4x / (x2 + 2)  +  16x3 / (x4 + 4)] #39, p223
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12/06/15

For f(x) = 3 + x, partition the interval [0,2] into n equally wide subintervals of length ?x = 2/n.
For f(x) = 3 + x, partition the interval [0,2] into n equally wide subintervals of length ?x = 2/n. Write the lower sum for this function and partition, and calculate the limit of the lower sum as... more
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12/05/15

The lengths of the sides of a triangular parcel of land are approximately 400 feet, 500 feet, and 750 feet. If land is valued at $2000 per acre (1 acre is 43,56
The lengths of the sides of a triangular parcel of land are approximately 400 feet, 500 feet, and 750 feet. If land is valued at $2000 per acre (1 acre is 43,560 ft2), what is the value of the... more
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12/05/15

Differentiate the function
Differentiate the function:   (x2 + 2√( x3)) / (4√x)     ANSWER: 3/8 x1/2  + 1/2 practice exam q #11
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12/05/15

Find d/dt g(t) where g(t) = 16 + x^2 - x * t - t^3
Find d/dt g(t) where g(t) = 16 + x2 - x * t - t3   This is the question exactly as written. I'm not sure if I'm supposed to insert parenthesis.     ANSWER: -x - 3t2 practice exam q #2
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12/05/15

Find the derivative of the function. Simplify where possible. h(t) = cot^-1(t) + cot^-1 (1/t)
Find the derivative of the function. Simplify where possible.   h(t) = cot-1(t) + cot-1 (1/t)     ANSWER: h'(t) = 0 #55, p 216
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12/05/15

I've been working on this but am missing something. it's asking me to find the domain
F (x)=log (x^2+9x+18)
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